Hi Simon -
You can find the Web Server Guide (PDF) on the Enterprise CD in the folder Support\Guides\GB - refer to the section titled Requirements which states:Install the Enterprise PDM Web server on a Microsoft Internet Information Services (IIS)enabled system.This can be a separate system or a system running the Enterprise PDM archive server,database server, or client. For more secure access, install the Web server component onits own perimeter network.
The document will guide you through the installation and setup process.
One thing to note about the Web Server is that it will only run on a 32bit OS.